上行车

He was covered with bruises after falling off his bicycle.

他从自行上摔了下来, 摔得浑身伤痕。

This motorcyclist who is motorial is cycling in the motordrome.

这个有运动神经的摩托手在赛路上骑自行。

He has a bicycle with lights powered by a dynamo.

他自行上的灯由机提供能源。

I had to strap the bag to my bicycle.

我得用子把包捆到自行上。

Evolving process of hub dynamo which used in bicycle is presented. The performance of magnetite viz. ferrimagnetism or NdFeB is analyzed. The prospect of marketing is viewed.

摘要介绍了自行上使用的花鼓机的演变过程，分析了所用磁石，即铁氧体或钕铁硼的性能优劣，并进行了市场前景展望。